Regarding Size Tolerances for Woven Sacks

Manufacturers of pp woven sacks typically produce products in multiple specifications and dimensions to cater to packaging requirements across various industries and applications, including grain, fertiliser, feed, and building materials. Consequently, when selecting pp woven sacks, customers should choose the most suitable specification based on their product's weight, volume, filling method, and transport and storage conditions, rather than relying solely on nominal dimensions as the sole reference standard.

During actual production, finished pp woven bags may exhibit reasonable dimensional tolerances within specified ranges, primarily manifesting as width and length deviations. The width deviation refers to the actual width of the finished Woven Bag being approximately 1 centimetre narrower than the standard width set during production. The length deviation occurs when, after deducting the 3–4 centimetres reserved for the bottom seam during cutting, the actual length of the finished bag may still be 1–2 centimetres shorter than the theoretical dimension.

These dimensional variations do not constitute quality defects but result from the inherent thermal expansion and contraction properties of the plastic webbing material. During weaving and bag fabrication, the woven fabric remains under considerable tension, while newly produced bags retain residual processing heat. As the product cools to ambient temperature post-manufacture, the material undergoes natural retraction, leading to slight dimensional reduction in both width and length.

This discrepancy primarily arises from the thermal expansion and contraction properties of the pp woven bagmaterial. During the weaving process on the machinery, the fabric is maintained in a highly taut state, and the freshly Woven Bags retain a certain residual heat. Once the finished product has cooled, both its length and width undergo slight shrinkage.

Naturally, narrower bags exhibit a lesser degree of shrinkage.